You're pinging somebody over email right now, but they'll probably need a reminder or follow-up in two days. CC twodays@followupthen.com, and if that person hasn't responded yet, they'll be automatically re-pinged 48 hours from now. It's a neat service, and it's free.

That's the main way FollowUpThen works: CC a message that needs a second push to an address like 5hours, 2days, 1week, or even 10minutes@followupthen.com, and if your recipient doesn't reply (with FollowUpThen as one of the addressees) before your time period is up, the original message is re-pushed by FollowUpThen.com, with a little email graphical tweak, seen above, and a notice that FollowUpThen is acting on your wishes.

If you want to handle the second notice yourself, add the @followupthen.com timed address to the BCC field, and it will only get back to you, with a reminder of what you sent. You can also send a message directly To: followupthen.com, and your reminder is pushed back to you at the time you specify. All these uses, and some basic explanation of FollowUpThen's methodology, is explained in this quick video tutorial:

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No software installs required, and it works from pretty much any email client after you verify your address upon first use. If you've got a clever use case for FollowUpThen involving webapps or other tools beyond the standard person-to-person email, tell us about them in the comments.